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/*
* arch/arm/mach-pxa/include/mach/gpio.h
*
* PXA GPIO wrappers for arch-neutral GPIO calls
*
* Written by Philipp Zabel <philipp.zabel@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __ASM_ARCH_PXA_GPIO_H
#define __ASM_ARCH_PXA_GPIO_H
#include <mach/hardware.h>
#define GPIO_REGS_VIRT (0x40E00000)
#define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
#define GPIO_REG(x) (*(volatile u32 *)(GPIO_REGS_VIRT + (x)))
/* GPIO Pin Level Registers */
#define GPLR0 GPIO_REG(BANK_OFF(0) + 0x00)
#define GPLR1 GPIO_REG(BANK_OFF(1) + 0x00)
#define GPLR2 GPIO_REG(BANK_OFF(2) + 0x00)
#define GPLR3 GPIO_REG(BANK_OFF(3) + 0x00)
/* GPIO Pin Direction Registers */
#define GPDR0 GPIO_REG(BANK_OFF(0) + 0x0c)
#define GPDR1 GPIO_REG(BANK_OFF(1) + 0x0c)
#define GPDR2 GPIO_REG(BANK_OFF(2) + 0x0c)
#define GPDR3 GPIO_REG(BANK_OFF(3) + 0x0c)
/* GPIO Pin Output Set Registers */
#define GPSR0 GPIO_REG(BANK_OFF(0) + 0x18)
#define GPSR1 GPIO_REG(BANK_OFF(1) + 0x18)
#define GPSR2 GPIO_REG(BANK_OFF(2) + 0x18)
#define GPSR3 GPIO_REG(BANK_OFF(3) + 0x18)
/* GPIO Pin Output Clear Registers */
#define GPCR0 GPIO_REG(BANK_OFF(0) + 0x24)
#define GPCR1 GPIO_REG(BANK_OFF(1) + 0x24)
#define GPCR2 GPIO_REG(BANK_OFF(2) + 0x24)
#define GPCR3 GPIO_REG(BANK_OFF(3) + 0x24)
/* GPIO Rising Edge Detect Registers */
#define GRER0 GPIO_REG(BANK_OFF(0) + 0x30)
#define GRER1 GPIO_REG(BANK_OFF(1) + 0x30)
#define GRER2 GPIO_REG(BANK_OFF(2) + 0x30)
#define GRER3 GPIO_REG(BANK_OFF(3) + 0x30)
/* GPIO Falling Edge Detect Registers */
#define GFER0 GPIO_REG(BANK_OFF(0) + 0x3c)
#define GFER1 GPIO_REG(BANK_OFF(1) + 0x3c)
#define GFER2 GPIO_REG(BANK_OFF(2) + 0x3c)
#define GFER3 GPIO_REG(BANK_OFF(3) + 0x3c)
/* GPIO Edge Detect Status Registers */
#define GEDR0 GPIO_REG(BANK_OFF(0) + 0x48)
#define GEDR1 GPIO_REG(BANK_OFF(1) + 0x48)
#define GEDR2 GPIO_REG(BANK_OFF(2) + 0x48)
#define GEDR3 GPIO_REG(BANK_OFF(3) + 0x48)
/* GPIO Alternate Function Select Registers */
#define GAFR0_L GPIO_REG(0x0054)
#define GAFR0_U GPIO_REG(0x0058)
#define GAFR1_L GPIO_REG(0x005C)
#define GAFR1_U GPIO_REG(0x0060)
#define GAFR2_L GPIO_REG(0x0064)
#define GAFR2_U GPIO_REG(0x0068)
#define GAFR3_L GPIO_REG(0x006C)
#define GAFR3_U GPIO_REG(0x0070)
/* More handy macros. The argument is a literal GPIO number. */
#define GPIO_bit(x) (1 << ((x) & 0x1f))
#define GPLR(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x00)
#define GPDR(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x0c)
#define GPSR(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x18)
#define GPCR(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x24)
#define GRER(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x30)
#define GFER(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x3c)
#define GEDR(x) GPIO_REG(BANK_OFF((x) >> 5) + 0x48)
#define GAFR(x) GPIO_REG(0x54 + (((x) & 0x70) >> 2))
#define NR_BUILTIN_GPIO 128
#define gpio_to_bank(gpio) ((gpio) >> 5)
#ifdef CONFIG_CPU_PXA26x
/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
* as well as their Alternate Function value being '1' for GPIO in GAFRx.
*/
static inline int __gpio_is_inverted(unsigned gpio)
{
return cpu_is_pxa25x() && gpio > 85;
}
#else
static inline int __gpio_is_inverted(unsigned gpio) { return 0; }
#endif
/*
* On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
* function of a GPIO, and GPDRx cannot be altered once configured. It
* is attributed as "occupied" here (I know this terminology isn't
* accurate, you are welcome to propose a better one :-)
*/
static inline int __gpio_is_occupied(unsigned gpio)
{
if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
int dir = GPDR(gpio) & GPIO_bit(gpio);
if (__gpio_is_inverted(gpio))
return af != 1 || dir == 0;
else
return af != 0 || dir != 0;
} else
return GPDR(gpio) & GPIO_bit(gpio);
}
#include <plat/gpio.h>
#endif
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